update gemspec
update gemspec

projecthydra-labs/geo_concerns,projecthydra-labs/pcdm-geo-models,jrgriffiniii/geo_concerns,yulgit1/pcdm-geo-models,projecthydra-labs/geo_concerns,geoconcerns/geo_works,jrgriffiniii/geo_concerns,geoconcerns/geo_works,projecthydra-labs/geo_concerns,yulgit1/pcdm-geo-models,yulgit1/pcdm-geo-models,jrgriffiniii/geo_concerns,geoconcerns/geo_works,projecthydra-labs/pcdm-geo-models,yulgit1/pcdm-geo-models,projecthydra-labs/pcdm-geo-models,geoconcerns/geo_works,projecthydra-labs/geo_concerns